The district says the later start times reflects a growing body of research supporting later start mornings for teens.

Boston Public School and MIT officials worked late into the night to finalize school start times. (Image Credit: Boston Public Schools)

Boston is also pulling back dismissal times at some elementary schools. The number of students dismissed after 4 p.m. will decrease from 33 percent to 15 percent next year.

The district worked with MIT researchers to develop the new schedule, which calls for schools to begin every 15 minutes between 7:15 a.m. and 9:30 a.m. The district serves 57,000 students in 125 schools.